Title :
Feedback increases neither the fading number nor the pre-log
Author :
Lapidoth, Amos ; Moser, Stefan M.
Author_Institution :
Dept. of Inf. Technol. & Electr. Eng., Swiss Fed. Inst. of Technol., Zurich, Switzerland
Abstract :
The feedback capacity of a single-input single-output fading channel with memory is investigated. It is shown that, asymptotically, as the signal-to-noise ratio (SNR) tends to infinity, noiseless feedback does not increase capacity. More specifically, for finite-energy stationary and ergodic fading processes that are regular (i.e., that have a finite differential entropy rate), feedback does not increase the fading number; and, for Gaussian fading processes that are non-regular, feedback does not increase the pre-log.
Keywords :
Gaussian channels; channel capacity; entropy; fading channels; feedback; Gaussian fading processes; SNR; channel capacity; ergodic fading processes; fading channel; feedback capacity; finite differential entropy rate; finite-energy fading processes; pre-log; signal-to-noise ratio; single-input single-output channel; stationary fading processes; Additive noise; Channel capacity; Entropy; Fading; Feedback; Gaussian processes; H infinity control; Signal processing; Signal to noise ratio; Transmitters;
Conference_Titel :
Electrical and Electronics Engineers in Israel, 2004. Proceedings. 2004 23rd IEEE Convention of
Print_ISBN :
0-7803-8427-X
DOI :
10.1109/EEEI.2004.1361127
